412 GUSTAF FR. GOTHLIN 
'12h.55 m. Although the animal is becoming narcotized, it 
has up to the present shown ‘‘reflex correction of position.” 
12 h. 37 m. The ciliary movements now begin to die out 
before the waves have reached the oral end of the rows. 
1h.3m. The animal now glides into a flat horizontal position. 
1h.9m-1h.19m. After the animal was removed in a condition 
of narcosis to a glass aquarium with plane walls a carefully cleaned 
punch, 3 mm. in diameter, was introduced into the mouth aper- 
ture. The animal is manoeuvred along to a glass wall, and then 
under the eyes of the experimenter the aperture of the punch 
is centred in relation to the statolith. When this is done the 
punch is pressed against the smooth glass wall so that the whole 
sense organ is removed. Immediately after the operation no 
swimming plates are striking. 
1h.20m. The animal is again placed in a cuvette containing 
sea-water without any addition. | 
1h. 27-m. In one row two of the first swimming plates are re- 
moved by the operation; this row is still mostly immovable. Spor- 
adic ciliary waves occur on all the other rows, but they are no- 
where synchronous in two adjacent rows. 
1h.31m. The animal is transferred again to the aquarium. 
7h. 42m. The animal rotates at one spot on the bottom of 
the aquarium. No regularly slower vibration can be observed in 
the lower rows; it is fairly often the other way about. When the 
lips are touched an inhibitory effect is certainly perceptible, but 
it seems to be limited to the rows that are nearest to the place of 
contact. It cannot be decided with the naked eye whether an 
actual condition of immobility occurs, as in this case it lasts only 
a fraction of a second. No ‘spontaneous’ total stoppage of the 
ciliary apparatus can be perceived. Sometimes, on the other 
hand, there occur, as it were, periods of wild ciliary vibration. 
1/8. 11 a.m. The opening of the wound is distinctly smaller 
today and its edges more even than yesterday. By means of 
mechanical irritation of the surface of the scar a total inhibition 
of the ciliary activity is easily caused. Although, as a rule, the 
animal has a very lively ciliary movement, there occur sometimes 
today spontaneous stoppages of short duration without any 
retraction of the rows. 
